141 lines
3.9 KiB
PHP
141 lines
3.9 KiB
PHP
<?php
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declare(strict_types=1);
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namespace PhpMyAdmin\SqlParser\Components;
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use PhpMyAdmin\SqlParser\Component;
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use PhpMyAdmin\SqlParser\Exceptions\ParserException;
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use PhpMyAdmin\SqlParser\Parser;
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use PhpMyAdmin\SqlParser\Token;
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use PhpMyAdmin\SqlParser\TokensList;
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use function count;
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use function implode;
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use function is_array;
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use function preg_match;
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use function strlen;
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use function substr;
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/**
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* Parses a list of expressions delimited by a comma.
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*
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* @final
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*/
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class ExpressionArray extends Component
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{
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/**
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* @param Parser $parser the parser that serves as context
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* @param TokensList $list the list of tokens that are being parsed
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* @param array<string, mixed> $options parameters for parsing
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*
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* @return Expression[]
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*
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* @throws ParserException
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*/
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public static function parse(Parser $parser, TokensList $list, array $options = [])
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{
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$ret = [];
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/**
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* The state of the parser.
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*
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* Below are the states of the parser.
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*
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* 0 ----------------------[ array ]---------------------> 1
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*
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* 1 ------------------------[ , ]------------------------> 0
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* 1 -----------------------[ else ]----------------------> (END)
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*
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* @var int
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*/
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$state = 0;
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for (; $list->idx < $list->count; ++$list->idx) {
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/**
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* Token parsed at this moment.
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*/
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$token = $list->tokens[$list->idx];
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// End of statement.
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if ($token->type === Token::TYPE_DELIMITER) {
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break;
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}
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// Skipping whitespaces and comments.
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if (($token->type === Token::TYPE_WHITESPACE) || ($token->type === Token::TYPE_COMMENT)) {
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continue;
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}
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if (
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($token->type === Token::TYPE_KEYWORD)
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&& ($token->flags & Token::FLAG_KEYWORD_RESERVED)
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&& ((~$token->flags & Token::FLAG_KEYWORD_FUNCTION))
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&& ($token->value !== 'DUAL')
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&& ($token->value !== 'NULL')
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&& ($token->value !== 'CASE')
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&& ($token->value !== 'NOT')
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) {
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// No keyword is expected.
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break;
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}
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if ($state === 0) {
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if ($token->type === Token::TYPE_KEYWORD && $token->value === 'CASE') {
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$expr = CaseExpression::parse($parser, $list, $options);
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} else {
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$expr = Expression::parse($parser, $list, $options);
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}
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if ($expr === null) {
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break;
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}
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$ret[] = $expr;
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$state = 1;
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} elseif ($state === 1) {
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if ($token->value !== ',') {
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break;
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}
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$state = 0;
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}
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}
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if ($state === 0) {
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$parser->error('An expression was expected.', $list->tokens[$list->idx]);
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}
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--$list->idx;
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if (is_array($ret)) {
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$retIndex = count($ret) - 1;
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if (isset($ret[$retIndex])) {
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$expr = $ret[$retIndex]->expr;
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if (preg_match('/\s*--\s.*$/', $expr, $matches)) {
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$found = $matches[0];
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$ret[$retIndex]->expr = substr($expr, 0, strlen($expr) - strlen($found));
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}
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}
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}
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return $ret;
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}
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/**
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* @param Expression[] $component the component to be built
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* @param array<string, mixed> $options parameters for building
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*
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* @return string
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*/
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public static function build($component, array $options = [])
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{
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$ret = [];
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foreach ($component as $frag) {
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$ret[] = $frag::build($frag);
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}
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return implode(', ', $ret);
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}
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}
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